Lighting-unit holder



April 20 1926.

' C. A. BRIDGES ET AL LIGHTJNG UNIT HOLDER Filed July 26. 1923 C I {VTQRS I WITNESSES 9 Patent-eel Apr.

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CHARLES A. BRIDGES AND SUTHERLAND, OF MILWAUKEE, W'ISCON- SIN, ASSIGNGRS TO IVIOE-BRIIDGES COMPANY, O13 MILWAUKEE, "WISCONSIN, A COB,-

IPQRATION OF 713001151121.

LIGHTING-UNIT HOLDER. i 1

Application filed July 26,

To all whom it may concem:

Be it known that we, Gimmes A. Bureaus and ALEXANDER K. SUTHERLAND, a citizen of the United States, and a subject of the King of England, respectively, both residents of liiilwaukee, in the county of Milwaukee and State of lVisconsin have invented new and useful Improvements in Lighting-Unit Holders, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to lighting unit holders and has for its object to provide means whereby the electric lamp may be moved longitudinally from the outside of the assembled fixture to focus it with respect to the globe.

1n many lighting fixtures of the closed type, known as commercial lighting units, in which a glass globe is mounted on and closed by a metal shell the position of the lamp filament with respect to the globe center is important as when out of position objectionable shadows will be produced and the fixturc will not show to advantage. It has been the practice to provide lighting unit holders of this type with internal means for accomplishing axial adjustment of the lamp but the necessity for removing the globe to make the adjustment was objectionable and a purpose of the present invention is to enable the adjustment to be performed from the outside of the assembled fixture, without removing the globe, so that the focusing may be quickly obtained, while the lamp is burning and the results of the changes are apparent.

Another object of the invention is to provide a lighting unit holder with such a lamp focusing feature without detracting from its ornamental appearance.

With the above and other objects in view the invention consists in the lighting unit holder as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in difi'erent views,

F 1 is a sectional view of a commercial lighting unit holder constructed in. accord A 4 B B H ance. with this invention;

1923. Serial N0. 653,920.

Fig. 2 is a plan view thereof with parts sectioned on the plane of line 2-2 of Fig. 1, and

Fig. 3 is a perspective view of the tubu- In the present instance the opposite ends of j the end link of the chain are let into diametrically opposite openings or recesses of a bushing member 14.- riveted or otherwise secured at the center of the shell 10, preferably so as to have a swivel connection therewith.

A. tubular stem 15 passes through the bushing member 14 so as to be vertically slidable therein, and a clamping screw 16 threaded in the bushing engages said stem to clamp it in its various adjustments. A head is formed around the upper end of the tubular stem .15 to prevent it from dropping through the bushing when the clamping screw is released, and a yoke member 17 is threaded or otherwise secured to the lower end of the stem and carries a lamp socket 18 having a lamp 19.

As shown the yoke member consists of a strap of sheet metal bent to the desired form, as shown in Fig. 8, the walls of the opening being drawn out to produce the threaded connection or the latter may be formed by a bushing riveted in place. The ends of the yoke are curved to fit in the usual joint between the members of the porcelain socket 18 which is of that type commonly known as a sign receptacle, the turning of the flanged collar of which serves to clamp the ends of the yoke.

The bore of the tubular stem 15 affords a passageway for the leading in wires (not shown), which may be trained on the chain as usual with sufficient loop to permit ofthe longitudinal adjustments of the lamp.

For adjusting the lamp it is only necessary to loosen the set-screw 16 and then raise or lower the lamp by means of the tubular stem and this may be done while the lamp is burning so that the effect may be seen duraljminneat ainl when the proper focus is obtained the setscrew 16 is tightened to lock the parts. In this manner the proper focusing of the lamp With respect to the globe is accomplished quickly and without ditticulty, there being no necessity for removing the globe to gain access to the adjustment parts The set-screws 11 for holding the globe to the metal shell 10 have their ends cut obliquely to fit against the flaring edge of the globe and, because of the flat surface 20 thereof bearing against the flange of the globe to support the weight of the globe, they are incapable of workingrloose. Another feature consists in providing the end link of the chain 13 with more than one seat for the next link, the inner surface of the bend of said end link being provided with notches or indentations 21, thus permitting the engagement to be adjusted in the nature of an adjustable clevis to compensate for any uneven distribution of weight. If the fixture tends to hang to one side it is only necessary to shift the link engagement slightly in that direction to cause it to hang straight and the notches facilitate such correction by affording additional link seats in which the second link may be engaged. A tendency for the fixture to incline out of the plane of the end link may be similarly compensated toby turning' the shell on its swivel connectiohi to bring it within said plane and then chz nging the seat as described. i

What we claim as new and desire to secure by Letters Patent is:

A lighting unit holder con'iprising a metal shell, a bushing swiveled therein, a chain having its end link split with its ends pivotally mounted in diametrically opposite openings of the bushing, a tubular stem slidably passing through the bushing, a set-screw threaded in the bushing tor clamping the tubular stem in its adjustments, a yoke threaded on the stem and provided with in turned ends, a sign receptacle clamped on the inturned ends of the yoke, a lamp contained in the sign receptacle, and a globe secured to the shell.

In testimony whereof we attix our signatures.

CHARLES A.,BRIDGES. ALEX ANDER K. SUTHE tLAND. 

